Lifting-jack



G. J. CAMPBELL.

LIFTING JACK.

APPLICAT ION FILED DEC. 71 1920.

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' LIFTING JACK.

APPLICATION Fl'LED DEC. 7, I920.

Patented May 3, 1921.

2 SHEETS-SHEET 2- 33mm George J 62019064! I Qflurmgi UNITED STATESPATENT OFFICE.

GEORGE J. CAMPBELL, OF POUGHKEEPSIE, NEW YORK, ASSIGNOR TO LANE BROTHERSCOMPANY, OF POUGHKEEPSIE, NEW YORK, A JOINT-STOCK ASSO- CIATION OF NEWYORK.

LIFTING-JACK.

Specification of Letters Patent.

Patented May 3, 1921.

Application filed December 7, 1920. Serial No. 428,911.

To all whom it may concern:

Be it known that I, GEORGE J. CAMPBELL, a citizen of the United States,and a resident of Poughkeepsie, New York, have invented certain new anduseful Improvements in Lifting-Jacks, of which the following is aspecification.

My present invention relates to improvements in lifting jacks of thestep up and step down type and more articularly t0 the form of jackshown in etters Patent of the United States, No. 1,181,395, granted toGeorge Lane, on the 2nd day of May, 1916, said patent disclosing a jackin which the raising or lowering of the jack is controlled by a shiftingof the handle bar in the socket of the actuating lever. In the saidpatented construction, the handle bar was positively locked or held inthe socket by a dog or pawl which, while permitting the relativemovement necessary to reverse the jack, yet prevented its completeremoval, whereby the handle bar was capable of being used for thepurpose of placing the jack in operative position and effecting itssubsequent removal; and in order to completely remove the handle, it wasnecessary to manipulate the dog or pawl.

The present invention aims to provide a construction in which the handlewill be so held-in the socket member as to enable the relative shiftingmovement to be imparted thereto while so held to effect the reversal ofthe jack and in which the handle bar will be retained in the socket withsuficient permanency to enable the jack to be manipulated by the use ofthe handle and yet enable the handle bar to be removed from the socketby a direct pull, thus avoiding the necessity of any manipulation of aseparate retaining awl. 1 p To this end the invention includes the novelfeatures of construction and arrangement and combination of partshereinafter described, the said invention being defined by the claimsappended hereto.

Several forms of my invention are illustrated in the accompanyingdrawings, in which- Figure 1 is a side elevation with parts broken awayshowing a sufficient portion of a jack to illustrate the invention,

Fig. 2 is it sectional detail,

Fi 3 is a View similar to Fig. 2, showing a di erent position of thehandle bar in the socket.

F ig'. 41 is a perspective view of the end of the handle bar.

Fig. 5 is a view similar to Fig. 41 but showin a modified form of spring1 through the handle bar of Fig. 5 and a socket lever or member modifiedto coact therewith.

Fig. 7 is a section on looking in the direction Fig. 8 is a perspectiveView showing a modified form of spring attachment.

Fig. 9 is a sectional elevation of a further modification, and Figs. 10and 11 are detail views illustrating a rotary handle.

Referring by reference characters to these drawings, the numeral 2designates the standard and 3 the lifting bar guided there in, beingactuated by the lifting or lowering pawl 5 cooperating with a holding orretaining pawl 4, the former being pivoted on the actuating lever ormember 6, and the latter on a fixed pivot carried by the standard.

The pawls are shown as connected by the close coiled springs 13 and 141to the bell crank levers 11 and 12, pivotally supported from thestandard and being under the tension of the common spring C.

Action of the bell crank levers and pawls will be readily understood bythose skilled in the art, it being understood that when the inner endsof the shoulders 11 and 12 are unobstructed, the operation of the leveror actuating member 6 effects an upward step by step movement of thelifting bar, while when the movement of said ends or shoulders isalternately obstructed, a step by step lowering of the bar takes place,the obstruction being accomplished by the spring-pressed cross bar 21.The handle bar is shown at 7 and it will be understood that when thishandle bar is pushed into the socket to its furthest extent, as shown inFig. 3, the obstructing cross bar 21 will be carried forward against thetension of its spring 22 into the position shown in dotted lines in Fig.1, where it will be out of position to contact with the shoulders 11 and12*. In this position of the parts, the up and down movement of thehandle bar will ra se the lifting line 7-7 of Fig. 6 of the arrow.

' down movement of the handle bar.

bar 3 in a manner well understood by those familiar with this type ofjack. However, when the handle bar is shifted backwardly to aslightextent (as indicated in Fig. 2), while held in the socket, thecontact bar 21 is allowed to assume the position indicated in full linesin Fig. 1 under the action of its spring 22 whereby it will contactalternately with the shoulders 11 and 12 of the bell cranks and socontrol the action of the pawls as to effect the step by step loweringof the 'ack.

3 One form of meansby which the handle bar 7 is held in the socket so asto be shiftable to either of the two positions required, in a-man'nortoenable it to be used for placing and removing the jack andyet to beremovable from the socket member by a direct pull, is shown in Figs. 1to 4. inclusive. In this form I interposebetween'the handle bar and thewall of the socket a friction member, preferably in'the form'of' aspring 8 carried by the side of the handle lever, to which it is securedby suitable means, such as a rivet 9,

the free portion of the spring tending to press against the wall of thesocket. This spring exerts sufficient pressure against the wall of thesocket to retain the handle bar against accidental displacement orremoval in the manipulation of the j ack, as, for instance, the placingof the jack under the axle of the car or its removal or during the upand It will be obvious that with spring friction means such asdescribed, the handle bar may be shifted int-he socket to either of thetwo positions desired to control the vertical movement ofthe liftingbar, merely by the application of sufficient force to overcome thefriction of the spring, and similarly the handle bar may be completelyremoved from the socket by an additional direct line pull.

I prefer to recess the handle bar as shown, to.

receive-the 'spri'ng,-the bend projecting beyond the walls of therecess.

In Fig. 5, I have shown the frictional retaining spring 8" as designedto retard the movement of the handle bar in its socket when the loweringposition is reached, while yet being capable of automatic yielding underfurther and harder pull to permit the removal of the handle bar. This isaccomplished by providing the spring with abend a which cooperateswith arib 6 on the wall of the socket, this bend terminating at the outer endin a notch or recess a with an inclined shoulder a which'is moreabruptthan the opposite wall of said recess a. The spring would yieldwith comparative ease under the action of the rib or flangefi under apush or pull to shiftthe' handlebar in the socket but when the handlebar is pulled outwardly from its in'nermost or lifting position theengagement of the rib or flange in the spring recess'a willautomatically stop further movement of the handle at lowering position,although the handle may thereafter be removed by a harder direct pull.

It is obvious-that the spring maybe set into a recess in the side of thehandle bar, as shown in Figs. 4 and 5, or that it may be secured to theunrecessed face of the handle bar, as shown at 8 in Fig. 8, in whichevent the socket would have to be correspondingly shaped.

Instead of placing the spring at the side of the handle bar as in thepreceding forms, I may place it on the bottom of the socket member, asshown at 8 and provide it with a bend m of reverse V-shape forming ineffect a shoulder or lug which projects through an opening in the socketmember and cooperates with reversed V-shaped notches Win the lower edgeof the handle bar, as shown in Fig. 9, the inclined walls'of whichpermit the handle bar to be shifted in the socket to either of twodetermined positions'or pulled completely out by a direct push'or pull.

It will be understood that this invention pertains only to the movement,holding and control of the jack handle in the lever socket, and whileillustrated in connection with jack mechanism as shown in Patent#1181395, it is equally applicable to any other mechanism where'reversalof the jack is effected by shifting the position of the handle in thesocket.

Instead of shifting the handlebar longitudinally in the socket to effectthe control or reversal of the jack theymay be accomplished by a rotarymovement as illustrated in Figs. 10 and 11-, in which the handle W ismounted to have a rotary movement in the socket 6 which is ofcylindrical shape to receive the cylindrical end of the handle bar. Thehandle bar has a substantially V-shaped notch sin its end in which themember 21 lies in one position of the handle bar (the lowering position,for example) while a substantially quarter turn of the handle bar causesmember 21 to be forced out of the notch or recess by the cam action ofthe walls, thus shifting said member 21 to raising position.

The handle bar has a transversely disposed elongated slot 7 which isengaged by a wedge shaped member-or dog 18 carried by the spring 8 andprojecting through an opening in the socketmember, said spring forcingthe dog into the slot and the partsare preferably so constructed andarranged that the inclined faces of the dog friction'ally engage theedges or walls of the slot, so that the handle baris frictionallyretained in either position to which it may be adjusted, though turnableumder the application of sufiic'ient pressure to overcome the friction.

When it is desired to remove the handle a direct outward pull of'sufiicient' force will cause the dog to be forced outward by reason ofits inclined face, thus permitting ready removal of the handle.

I claim:

1. A lifting jack comprising a standard, a lifting bar movably guidedthereby, mechanism for moving the bar upward and downward, saidmechanism including a rocking member having a socket, a hand leverhaving an end detachably held in said socket to have relative movementtherein while soheld, means controlled by said relative movement of thehand lever to determine whether said mechanism shall raise or lower thelifting bar, and frictional restraining means interposed between thehandle bar and the socket.

2. A lifting jack comprising a standard, a lifting bar movably guidedthereby, mech anism for moving the bar upward and downward, saidmechanism including a rocking member having a socket, a hand leverhaving an end detachably held in said socket to have relative movementtherein while so held, means controlled by said relative movement of thehand lever to determine whether said mechanism shall raise or lower thelifting bar, said socket and said hand lever having frictional engagingmeans comprising a spring carried by one part and frictionally engagingthe other art. p 3. A lifting jack comprising a standard, a lifting barmovably guided thereby, mechanism for moving the bar upward anddownward, said mechanism including a rocking member having a socket, ahand lever having an end detachably held in said socket to have relativemovement therein while so held, means controlled by said relativemovement of the hand lever to determine whether said mechanism shallraise or lower the lifting bar, a leaf spring having one end secured toone face of the actuating handle and having a bend or swell terminatingtoward the free end of the spring in an inclined shoulder, and a rib orprojection on the socket wall cooperating with said bend and shoulder.

4:. In a lifting and lowering jack in which the control of the jack iseffected by the position of the handle bar in the socket of theactuating member, means for releasably holding and positioning thehandle bar in the socket member comprising a leaf spring carried by oneof said parts and having a curved portion or bend terminating at itsbase at one end in an inclined shoulder, and a rib on the other partcooperating with said bend and inclined shoulder.

5. In a lifting and lowering jack in which the control of the jack iseffected by the position of the handle bar in the socket of theactuating member, means for releasably holding and positioning thehandle bar in the socket member comprising a leaf spring carried by oneof said parts, and

' having a bend cooperating with a shoulder on the other part.

In testimony whereof I afiix my signature.

GEORGE J. CAMPBELL.

